486 Transactions South African Philosophical Society, [vol. xii. 



clypeus transverse, sinuate laterally and a little angular at base, 

 close to the apical margin there is a median, bluntly bifid tubercle ; 

 prothorax covered in the anterior and lateral parts with very densely 

 set punctures coalescing on the sides, but the median posterior part 

 of the disk, as well as a narrow transverse strip along the basal 

 margin, is impunctate, the apical margin is sinuate but not 

 recurved in the middle, and there is a narrow, triangular impression 

 beginning close to the apex and reaching beyond the median part 

 where it is continued in a shallow sulcus which disappears near the 

 base ; scutellum short, nearly triangular, deeply and moderately 

 closely punctured; elytra punctato-striate, eighth stria disappearing at 

 a short distance from the humeral callus ; anterior tibiae six-dentate ; 

 legs and under side densely pubescent. 



Length 12|- mm. ; width 7^ mm. 



Male unknown. 



This species closely resembles the male of B. capense, but the 

 cephalic horn is not placed quite so near the apex, and is more 

 upright, and there is only one deep, triangular impression in the 

 median part of the prothorax ; the eighth stria does not ascend quite 

 so near to the humeral callus. 



Hab. Mozambique (Louren90-Marquez). 



BOLBOCERAS PLAUSIBILE, n. SpeC, 



Plate XXXVI., fig. 22 ; Plate XXXIX., fig. 8. 



Brick-red, shining, head ferruginous ; labrum widely but not 

 broadly emarginate, and transversely carinate close to the apex, 

 clypeus very short, truncate at tip, slightly sinuate laterally, head 

 with a transverse, very slightly raised carina reaching from one side 

 of the base of the clypeus to the other, and strongly dentate in the 

 centre as well as on each side of the clypeal base, the median part 

 of the head is somewhat depressed, and the surface is covered with 

 closely set, round punctures, which, however, are widely scattered in 

 the posterior part ; prothorax covered with not closely set, round 

 punctures, which are very little denser in the posterior part than on 

 the sides, but are a little more closely set in the impression which is 

 shallow and retuse, does not reach the apex, and is very slightly 

 bi-aculeate, or rather angular on each side at tip (in the figure given 

 in plate xxxvi. this aculeation is not sufficiently shown) ; this 

 impression does not extend to more than one-third of the length 

 there is a slight longitudinal, median groove reaching from the top 



